I think a finned heat sink would do more for cooling than tape would. I think I got my rebuilt pcm from resources, i will check. it really needs to match engine , tranny and gear ratio

 

Are there no junk yards in your area?

 

Keep in mind that any and all electrical and electronic devices (such as a PCM) generates heat as it operates. Taping it up will trap the heat it generates. Most electronic devises faile due to heat. Shielding it from heat from the engine bay, if it can be done, would be nmore effective.

 

I was thinking relocating it INSIDE the truck, completely away from that nice, toasty warm engine.... wouldn't be such a bad idea.

 

this is a real shade-tree rig, but to test the theory of overheat you could rig up an electric fan to blow on it.

 

Looks like the heat shield tape didn't work. I let it idle for a while and it finally shut off on me in 90F heat. Turned the key and the gauges failed to move and the fuel pump failed to prime. Took the PCM off and it was hot as hell like the other time. I removed the tape and sat it on the AC in my house to cool it off. Put it back on the truck and it started up. Looks like I am going to have to break down and get another PCM. It's a shame that Dodge designed it so that the PCM is in such a harsh environment, but the truck has 216,000 miles on it, so it's good it has lasted that long.

 

If itis gettinghot enough to shut it doen, I would suspect that there is at least one circut that is overleaded and creating the heat. Any way to stick additional ground wire on it and ground to firewall? Just throwing something out there...

 

Time for a new pcm. simple as that. We've all seen these issues before with pcm's that overheat.

 

Same problem with my Dodge Ram 3500 van (2000). Replaced ECM 6 (!) times in 4 years, twice under warranty. Sometimes gives false positive trouble lights, sometimes won't restart until cools down (gauges also don't register).
I'm really hoping someone has found a solution like a heat sink or shield that works. Or move it to the interior? I'm told this is really common with Dodge, and becoming more common. I think the remans get sent back, maybe under warranty, test ok when cold, and get sent back out because they tested ok (when cold), so there is an insoluble residue of defectives accumulating in the circulating pool of remans that keep getting sent out.
Computers are sensitive to heat and vibration, so where do they put it? On a hot, vibrating machine. But Dodge doesn't seem to even have any interest in recommending a fix. Probably their lawyers won't let them admit there's a problem. Do I sound bitter?
Has anybody found a solution other than replacing it?

 

Where are you getting your PCM's from? Some vendors are better than others......